From a cosmic perspective, our planet has a peaceful beauty — no matter what tumult is raging far below. That's the message NASA astronaut Ron Garan wanted to send with this picture of the northeastern United States. Today, if you could zoom in far enough on this view today, you could see the anguish left behind in the wake of Friday's horrible school shooting in Connecticut.

"When we look at Earth from space, we are faced with a sobering contradiction," Garan writes on his Google+ page. "On the one hand is the beauty of our planet, on the other is the unfortunate reality of life on our planet for many of her inhabitants. Our prayers are with the victims and families in Connecticut. #LoveConquersAll"

Garan wasn't the first human to reflect on the cosmic perspective produced by outer-space views: Astronauts and philosophers have long talked about the "Overview Effect," the sense of planetary unity that arises when you see Earth as an object suspended in space. Just this month, a group known as Planetary Collective unveiled an online video documentary exploring the phenomenon.

And then there's Carl Sagan, the famous astronomer and writer who passed away 16 years ago this month. He helped persuade NASA to turn the camera on its Voyager 1 deep-space probe back toward Earth in 1990, to capture a priceless picture of our "pale blue dot" as a speck in outer space.

"There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world," Sagan wrote. "To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known."